Heating and annealing furnace.



v I Patented Dec. 26, I899. W. GRIFFITH 8:. J. M. ANDERSON.

HEATING AND ANIIEALING FURNACE.

(Application filed Dec. 17, 189B.) (No Model.) 2 Sheets-Sheei l.

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No. 639,970. I Patented Dec. 26, 1899. W. GRIFFITH 8n]. M. ANDERSON.

HEATlNG AND ANNEALI NG FURNACE.

(Application filed Dec. 17. 1898.)

2 Sheeis-Sheet 2,

(No Model.)

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WILLIAM GRIFFITH AND JOHN M. ANDERSON, OF PITTSBURG,

I PENNSYLVANIA.

HEATING AND ANNEALING FURNACE.

SPECIFICATION forming part of Letters Patent No. 639,970, dated December26, 1899-. I Application tiled December 17, 1898. Serial No. 699,549.(No model.)

To a whom it may concern.-

Be it known that we, WILLIAM GRIFFITH and J OI-IN M. ANDERSON, ofPittsburg, in the county of Allegheny and State of Pennsylva nia, haveinvented a new and useful Improvement in Heating and Annealing Furnaces,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, in which- Figure 1 isa longitudinal central section of our improved heating-furnace. Fig. 2is a horizontal section on the line II II of Fig. 3. Fig. 3 is across-section on the line III III of Fig. 1, and Fig. 4 is a similarview on the line IV IV of Fig. l.

The object of our invention is to provide a heating, annealing, orsmelting furnace of large capacity in which copper, zinc, brass, gold,silver, sheet-iron, packs of black plate, bars or billets, and otherarticles or metals may be heated, annealed, orsmelted withoutoxidization.

Our invention consists in arranging the flues and ports with respect tothe annealing, heating, or smelting chamber in such a man ner as willinsure the equal distribution of the heat upon all sides of theannealing or heating chamber. To accomplish this, we arrange a flue orflues between the furnace-roof and the bridge-wall and top of theheatingchamber, which carry the caloric current to adistributing-chamber in the front wall of the furnace, whichin thepresent case is the front wall of the heatingchamber as well. The heatis thence conducted downwardly and beneath the heating-oven to a chamberin the bridge-wall, from whence it is carried along flues in the sidewalls of the furnace, which serve as the side walls of theheatingchamber. These flues lead to'a suitable stack.

In the drawings, 2 indicates the walls of the furnace, and 3 thecombustion-chamber.

The main roof of the furnace4 is a suflicient distance above the roof 6of the annealing-chamber 9 and the hollow bridge-wall 5 to form a flueor flues 7. The bridge-wall is formed with a chamber 8, the purpose ofwhich will be hereinafter described.

In the drawings we have shown a series of flues 7, which are distributedin such a way as to direct the caloric current equally, so

that when delivered to the distributing-chamber 10, formed in the frontwall of the furthat the column'between the openings into theannealing-chamber is built hollow, so as to form the flue 11. Theopenings into the an nealing=chamber are covered by arches,which formthe bottom of the distributing-chamber 10. These openings just describedare closed by suitable doors, (not shown), which can be luted orotherwise sealed, so as to exclude the air from the annealing-chamber 9.Be= neath the floor of the annealing-chamber are flues 14, whichcommunicate directly with the cross-flue or header 13 and at the otherend with the chamber 8 in the bridge-wall. In this chamber the heat iscollected. and then distributed by the ports in this chamber that openinto the flues 15 in the side walls of the furnace, which, as shown inthe drawings, serve as the side walls of the annealing-chamber 9. Theexit-flues 16 lead to a stack 17, which may be located at any convenientpoint.

The operation of our invention is apparent. The caloric current is drawnby the draft of the stack through the flue or flues at the top of thefurnace, so as to heat the upper portion of the annealing-chamber,thence into the dis tributing-chamber, which beats a portion of thefront wall, and the diving-flues further carrying out this heatingaction. The caloric current on reaching the cross-flue passes into theflues beneath the floor of the heating chamber and heats the same to thedesired temperature, and thence into the chamber 8, where it comes intocontact with the rear wall of the heating-chamber 9. The heated currentsthen pass through the flues in the side walls forwardly, as shown in thedrawings, and heat the side walls of the heating-chamber. After this hasbeen accomplished it is not material'where the exit ports or flues lead;but we have illustrated a convenient location for these ports andstack-flues.

The advantages of our invention will be appreciated by those skilled inthe art, since by constructing a furnace as just described a uniformdistribution of heat is effected, all parts of the heating or annealingchamber being brought into contact with the caloric current, aheating-chamber of large capacity is afiorded, and a simple andeconomical furnace is produced, so that the annealing or heating processmay be conducted expeditiously and with none of the trouble andannoyance arising from the use of annealing boxes which have beengenerally employed heretofore.

Changes may be made within the scope of our claims in the number andarrangement of the flues,and other modifications will suggest themselvesto those skilled in the art. Such changes maybe made without departingfrom the spirit and scope of our invention, since We claim- 1. Thecombination with an annealing or heating furnace having acombustion-chamber and a bridge-wall, of a heating-chamber, fiues abovethe bridge-wall and heating-chamber, a distributing-chamber incommunication with said flues, diving-fines leading from saiddistributing-chamber, flues beneath the heating-chamber with which saiddiving-flues communicate, a second distributing-chamber in the rear ofthe heating-chamber, flues in the side walls of the heating-chamberleading from said second chamber, and a stack communicating with saidside fiues, substantially as described.

2. In combination with an annealing or heating furnace having acombustion-chamber and a bridge-wall, a heating-chamber, fiues above thebridge-wall and heating-chamber, a pair of openings through the frontwall of the annealing-chamber, a distributing-chamber formed in saidfront wall above these openings, diving-flues in the walls surroundingsaid openings and in communication with the distributing-chamber, acrossflue or header into which said diving-fines lead, a flue or fluesbeneath the floor of the annealing-chamber, a second distributingchamberin the rear of the annealing-chamberin communication with said finesbeneath the annealing-chamber, flues in the side walls of theannealing-chamber leading from said second chamber and a stack incommunication with said side fines, substantially as described.

In testimony whereof we have hereunto set our hands.

WILLIAM GRIFFITH. JOHN M. ANDERSON.

Witnesses:

JAMES B. BAKEWELL, EDW. FRIEBERTSHAUSER.

